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matlab_reduce_noise
- matlab去除50hz噪声。 我用电脑录了一段声音，里面有50hz的周期噪声（因为受交流电干扰）。而我自己的声音频率最低是90hz。我使用了一个10阶butterworth高通滤波器，边带是70hz(介于50跟90之间)。 问题是，这不能直接用。因为声音文件的采样率是22k，70相对于22k来说太小了。所以我得先把我的声音欠采样，然后再滤波，然后再插值。
analoge_high_pass
- In oreder to compare Impulse Invariance method charactristics for transformation analogue filters to digital ones in highpass and bandpass and lowpass formats,here are 6 M-files that simulate a third order butterworth filter analyizing impulse respon
voice
- 本程序为一个用matlab实现的语音滤波程序，能计算并显示语音信号的幅频特性，巴特沃斯低通滤波器幅度和相位响应，引入噪声后的幅频特性，以及滤波后的DFT幅频特性。本程序附有语音文件以供试验。-This program is an implementation using matlab voice filtering procedures, can calculate and display the speech signal amplitude-frequency characteristics
bditong
- 用matlab实现巴特沃斯低通滤波器的M文件。本例读取电脑自带的XP开机声音，加上高频噪声，然后滤波看效果。-Butterworth low-pass filter using matlab M-file. This case, read the computer comes with XP start-up sound, coupled with high-frequency noise, and then filter to see the effect.
bdaitong
- 用matlab实现巴特沃斯带通滤波器的M文件。本例读取电脑自带的XP开机声音，加上噪声，然后滤波看效果。-Using matlab to achieve the M-file Butterworth bandpass filter. This case, read the computer comes with XP start-up sound, plus noise, and then filter to see the effect.
bgaotong
- 用matlab实现巴特沃斯高通滤波器的M文件。本例读取电脑自带的XP开机声音，加上低频噪声，然后滤波看效果。-With Matlab M-file Butterworth high-pass filter. This case, read the computer comes with XP start-up sound, coupled with the low-frequency noise, and then filtering to see results.